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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3a3bba8d2906aadd6e1966f493f1ddb5c78222ad9ea19dc2670e9331cc69b5' 
  AND token = '6aWYFIVFPMRKotxnTnquNFOHCL/phqqVapDkNEFrvCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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