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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fb0f0ec66cb91c6ba69f5c6102ec7643ccd2bd24bba27e1a43ec86dc865bf3' 
  AND token = '5x/2/BlhpUACXMj/csk5aTthy++OoCTQuaNy9379tds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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