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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ea6afd50e4518d97c4c474620251b1e77c1db8bc78d745290370736b45069a' 
  AND token = 'AMY7e7aN9CUnwgYQfYYZ/3L+vB/JHCSUqJQnkcYUywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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