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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4d40571a6ec529bfdcafe21ec892d1887556128267cf954f4d8742c90210cf' 
  AND token = '9lz83CyIAd+LPtstG71ViIVVyHI1Rnm0fP6UNpRfXGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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