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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0e09f00628e96dab26644316d72cc9b0504a06f3b734bbb33f7136ee23066b' 
  AND token = 'cRRNPWCY279nCffQi3GNPswrKjqLKZBCCz/PTDsP1lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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