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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc40e31b5756014d5d8f8ea7081e9e95311f03061644140ca334d740d0826f6a' 
  AND token = 'F4YfiKlB8Uv479HChmhuBng/tj6Paipqwk3tFWgxaBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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