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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8d73eb068f2bff195fac397a18829eed94c0465ef561e74db44d9aae6f42f3' 
  AND token = '75dkLmh4m6pmx0Sk5Q487NCXnvc4Fqw5x3AmocFOnsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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