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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723e5b7ec2037482612544420269d46c2c97ce0ea851162b282f9866bc43b70a' 
  AND token = 'i+9DvCEEjILwh7YmG790fieNOEYkwS9JDW7p+kygIxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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