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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7f69b0a08f4217f39ecdd53ddd28a267d1508c4fa06dd76d0a6062bcf37ae4' 
  AND token = 'bqaMkYUhc120snm3YumFgVgG3CEESVty+sNy59f8nT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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