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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb2510e7443bf68c760d0e27cfb2ae65abce72471928b6e55d3e2475889838e' 
  AND token = 'MPBGCzPakLt9ei4oYhfim1vDCaf9AYIjQQOl3kp6nyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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