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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee3d0ae99fbf622a4a7cd54d984f70992c88eef52f9f714484b73fc9e765f22' 
  AND token = '7PQ2R9IAhq95hzuusPFxF3ninOTdkmWFaJnMJBhNaFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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