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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6f0c203ea6af2fa6011afa7e6b639a28ede5637ae1250294b9c03a712ac7c7' 
  AND token = 'ooesA4fO0bJaFmFGgC/oIs14RFKP0gv1JczjjqcJzmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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