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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8da995f1640f1623535b0b37e892ea6dac1ddaa8faf61f46ca0012170464407' 
  AND token = 'pln6oHZqX2+U0/HAcvo9bn2pNoc66lN+mlY7W1yL8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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