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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67033a4ad34f394f2f344d92872eecb071c72994b8b3f29f35744d3380828d51' 
  AND token = 'TTSAbty0tSDCZodRz8tb+tYaqZjh1CYu0higgzZskyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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