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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900328b42f8fa1e007c92800e60fab9e0f89b1f982197d8d6604ee72e7df3472' 
  AND token = 'rTSB7fSxx/5CTrPXpVaCF/ZbRwNDxZ4q5P4AnxSuYtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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