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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd36c8409ed9d4022f3641a5ee4a034e9f02b56b13557fef07240f9a7631415' 
  AND token = 'cctl88Nf+1+QRFvbq72h6rlyNK1Kb1o4/s5jPFlwou0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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