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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13db437ae42095f3f2b49379cf58bc8229708875089c5917422972b1c53b23cc' 
  AND token = '6TW5RkZ7UYK/ZN0+4pe+5Q1hrzse5L55oupO2LdRR/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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