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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f313c74122b99e85fee57d1f8b3ce04ef5eddf7fac00a26326edc2c85d37c39' 
  AND token = 'q8vVvNKwtmZeL798De2BAC6Q+2kPScMNabUQoE2R+Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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