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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d0ab64df6e1e1e847f687e6a0070c3b970c3cedce5103d74b075d0244f3a2a' 
  AND token = '/dyEijzZCLPGijwmAdYvRysoCKLQMxRf3X4J2AvvLbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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