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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabbe8652bfb12e0ad1528ebed9421592e2e05b54596d090404c5086ca4f2cd4' 
  AND token = '4JdAZaTvHGjJQGmZYoKJD8nH/WUoZ3vMW5QcIGchTGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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