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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2af95359384c01d01f69b8ab2311de854fb1dd3bdcedb756ae84a204036da79' 
  AND token = 'FZnP03bqgojLccgCc72OCEXUUb/qMy8l2vwirACYh+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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