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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a696fc97edfd3a02e12d94c7d7e161f6e45ccaa2d075e7824fafd88f2724794c' 
  AND token = 'W4D25A3NeUQ+fh65GbjK/FGC+z4A5jPX33j6222n+H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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