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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a5b9e19eecc8bfbe407c6ba455c59499fd5542644f2ceb1f223b328b4371e1' 
  AND token = 'P4gAVpz5rFNI9yzdKgJZaCUMRsZs5sfjv81WVcFumhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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