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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc773bc3110d2281f90b00fdde673953c4c5c715b1ad107f90da603619a32c4d' 
  AND token = 'kDvoLAGngLfkelbDwEHLfq2uGVXTDodU0iLnV0vfpw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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