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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f472dd743f9cb6520022faea4a8a317d6df71764969ef44dbaaebfea6a8656b' 
  AND token = 'B636EJ+hKAfuFiMNNGLE/jWXBwucpPaPT3UD4sPmGXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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