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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbf7dee23f6253e175a2a7f7557abdfe04f4930a34f6538996c08aff6daaba6' 
  AND token = 'ai5Mwroocv9SGr77ukggrMmgQaAOlUWa6T9UYpRuPLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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