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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241fc34a13cb6c3df75f7534fde3d502c46a8074aa824b351b4c37d7bded435c' 
  AND token = 'k/ybRw29Hlo383Ybv58b6HdU6L6Vj+cd8h1JUpns7ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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