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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbca020f2ccca2c0f88a5f40a6d4a027007a71ef01b0f2c0c2481222a8f1551' 
  AND token = 'XA/Y7NDGT5eDS6rBQ6oGVEVh1zGrVH8d8UUs/H2AAu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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