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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ddf089dee77896905692b7f7f33d2a9480dea7a16a5fdaaf669bf47506d944' 
  AND token = 'Ua2CX1e/AMZmbU+DU5MLEbnfTjzz1bThC50rVa8PBCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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