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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907dbe8c4abfa08525f45232cf72d37ea956ae2e57f96ebe3f367a55f7522658' 
  AND token = 'FIjnhbUsxfWAlvJAk6JKkPPMvcc5t7mpVAn09w/p3GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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