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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67941a81f168fad66c8886b272c2c07ce46b00040d0832b2039a2b223267441' 
  AND token = 'dr7rmydl0mOFe18RixL9/Ma68ofQD1PWv9CqmUTtjLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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