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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497afc9c707749ce75855aabffca81be9a954430504e46f236fddecef916c753' 
  AND token = '/wB4Rr2NX04Dlruwp5hCimoCn40h17HC+sJzbGTL8OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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