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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11aff3410aadab4f8a4faedd370dff11adc9d2ae21370beb3ed089b5dcdb454b' 
  AND token = 'CGzi4VMZ2w2FkhxNCOM8Jscp7i4P/msinUTadIlsWLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}