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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959c52dd077d4618eaea2bfd0ed3fa789d1159e1418c52b46278720aba9df58a' 
  AND token = 'W4vA2hYibDXsbiCHWn+dvrvO2nuYHlvbP8JOuOXUF/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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